Swept surfaces

 From:  tyglik
Hi Michael,

I have noticed that some surfaces created by sweeping can be deformed smoothly by their control points, although the same direct manipulation of control points would lead to a crease in Rhino. Does it mean MoI replaces an original surface by a "simplified" version when some conditions are met? So for example the surface in an attached behaves as it would be a modified deformable sphere.